Java 除以两个微调器值

我已经设法让微调器值显示在文本框上，但我需要将这些值彼此分开。所以我必须将微调器1的值除以微调器2的值。然而，我不确定如何做到这一点

这是我的密码：

public class CurrencyActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.currency);


 final Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
 final Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);
 final EditText etResult = (EditText) findViewById(R.id.etResult);
 final MyData items[] = new MyData[3];
 items[0] = new MyData("EUR, Euro","1.00");
 items[1] = new MyData("GBP, British Pound","5.00");
 items[2] = new MyData("USD, US Dollar","15.00");

ArrayAdapter<MyData> adapter = new ArrayAdapter <MyData>(this, android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter);
spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {


    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){
        MyData d = items[pos];
        etResult.setText(d.getValue());
}

    @Override
    public void onNothingSelected(AdapterView parent){
        //Do nothing

}
});



spinner2.setAdapter(adapter);
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){
        MyData d = items[pos];
        etResult.setText(d.getValue());
        }

    @Override
    public void onNothingSelected(AdapterView parent){
        //Do nothing
    }
 });

---

谢谢

有一个简单的解决方案，但我认为您在这里混合了代码。 Integer.parseIntd.getValue将为您提供一个有效的int，您可以对其执行任何数学函数，但在您的代码中，当每个微调器选择发生更改时，您实际上会覆盖MyData d。

---

您可以在MyData类中添加另一个字段，该字段将存储您想要的任何值作为int，然后简单地使用MyData.getVal，假设MyData的类型为/class MyData。

我能够解决这个问题

我将MyData类中的值类型从String更改为double。 我在CurrencyActivity中创建了两个名为valA和valB的双字段

然后在方法中，我将微调器的值指定给val字段，例如。 valA=d.getValue

然后我创建了一个新的方法，只做了valA/valB

下面的代码有助于更容易理解

public class CurrencyActivity extends Activity {
double valA; 
double valB;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.currency);


final Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
    final Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);
    final EditText etResult = (EditText) findViewById(R.id.etResult);
    final MyData items[] = new MyData[3];
    items[0] = new MyData("EUR, Euro",1);
    items[1] = new MyData("GBP, British Pound",5);
    items[2] = new MyData("USD, US Dollar",15);

ArrayAdapter<MyData> adapter = new ArrayAdapter <MyData>(this,  android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter);
spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {


    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){
        MyData d = items[pos];
        valA=d.getValue();
}

    @Override
    public void onNothingSelected(AdapterView parent){
        //Do nothing

}
});



spinner2.setAdapter(adapter);
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){
        MyData d = items[pos];
        valB = d.getValue();
        }
    @Override
    public void onNothingSelected(AdapterView parent){
        //Do nothing
    }
 });

public void divideVals(){

    double result = valA / valB;
    etResult.setText(String.valueOf(result));
}

---

希望这对其他人有所帮助，因为我花了很长时间才弄明白这一点，结果非常简单。

与你之前的问题和这一点有关吗？@Raghunandan是的，但我取得了一点进步。另一个解决方案对我不起作用。谢谢你，你的解决方案帮助我朝着正确的方向前进。我在CurrencyActivity中又创建了两个双字段，例如valA和valB，然后valA=d.getValue，然后我创建了一个方法，只做了valA/valB；

public class CurrencyActivity extends Activity {
double valA; 
double valB;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.currency);


final Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
    final Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);
    final EditText etResult = (EditText) findViewById(R.id.etResult);
    final MyData items[] = new MyData[3];
    items[0] = new MyData("EUR, Euro",1);
    items[1] = new MyData("GBP, British Pound",5);
    items[2] = new MyData("USD, US Dollar",15);

ArrayAdapter<MyData> adapter = new ArrayAdapter <MyData>(this,  android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter);
spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {


    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){
        MyData d = items[pos];
        valA=d.getValue();
}

    @Override
    public void onNothingSelected(AdapterView parent){
        //Do nothing

}
});



spinner2.setAdapter(adapter);
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){
        MyData d = items[pos];
        valB = d.getValue();
        }
    @Override
    public void onNothingSelected(AdapterView parent){
        //Do nothing
    }
 });

public void divideVals(){

    double result = valA / valB;
    etResult.setText(String.valueOf(result));
}